Reddit is basically split into lots of sub sites called 'subreddits'. You pick ones you're interested in, for example http://www.reddit.com/r/gamedev and you comment on submissions and perhaps submit your own links as well for others to comment on.

Anyone can set up your own subreddit but it's probably best not too until you have a lot of users as otherwise it will be very empty :)[/QUOTE]

Thanks, that helps a lot. Now on to Google+. I know some programmers are gung ho on G+ and I'm reading an eBook on it now by Guy Kawasaki.